From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
intel_check_clock() can be used to check clock validity w/o modifying
hardware state.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 2 ++
drivers/gpu/drm/i915/intel_display.c | 34 ++++++++++++++++++++++++++++++++++
2 files changed, 36 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index ab0bd29..c41982e 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1719,6 +1719,8 @@ extern bool intel_fbc_enabled(struct drm_device *dev);
extern void intel_disable_fbc(struct drm_device *dev);
extern bool ironlake_set_drps(struct drm_device *dev, u8 val);
extern void intel_init_pch_refclk(struct drm_device *dev);
+extern int intel_check_clock(struct drm_crtc *crtc,
+ const struct drm_display_mode *adjusted_mode);
extern void gen6_set_rps(struct drm_device *dev, u8 val);
extern void intel_detect_pch(struct drm_device *dev);
extern int intel_trans_dp_port_sel(struct drm_crtc *crtc);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2a2c664..dcd61fb 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5686,6 +5686,40 @@ static int haswell_crtc_mode_set(struct drm_crtc *crtc,
return ret;
}
+int intel_check_clock(struct drm_crtc *crtc,
+ const struct drm_display_mode *adjusted_mode)
+{
+ struct drm_device *dev = crtc->dev;
+ intel_clock_t clock, reduced_clock;
+ bool has_reduced_clock = false;
+ bool ok;
+
+ if (IS_HASWELL(dev)) {
+ if (!intel_ddi_pll_mode_set(crtc, adjusted_mode->clock))
+ return -EINVAL;
+
+ if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev)) {
+ ok = ironlake_compute_clocks(crtc, adjusted_mode, &clock,
+ &has_reduced_clock,
+ &reduced_clock);
+ } else
+ ok = true;
+ } else if (HAS_PCH_SPLIT(dev)) {
+ ok = ironlake_compute_clocks(crtc, adjusted_mode, &clock,
+ &has_reduced_clock, &reduced_clock);
+ } else {
+ int num_connectors = 0;
+ bool is_dp = false;
+ int refclk;
+
+ ok = i9xx_compute_clocks(crtc, adjusted_mode, &clock,
+ &has_reduced_clock, &reduced_clock,
+ &refclk, &num_connectors, &is_dp);
+ }
+
+ return ok ? 0 : -EINVAL;
+}
+
static int intel_crtc_mode_set(struct drm_crtc *crtc,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode,
--
1.7.8.6
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